Do you know someone who has noticed unexplained activities at their home or business? If so, some local Ghostbusters would love to investigate at no cost. Houston Ghost Town Paranormal Investigations is a non-profit organization that helps you explain the unexplained. Check them out at www.HoustonGhostTown.com. They are actively looking for sites to research.
I remember hearing 'ghost stories' from a childhood friend almost weekly. It seems the whole family was convinced they had a mischievious poltergheist living with them. Cabinets would open mysteriously when nobody was nearby and the hair dryer would turn itself on. They would have loved to have confirmation of their suspicions.
The Seller's Disclosure Form in Texas doesn't address this issue, so if you are curious, now you have someone to call.